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Glacier monitoring relies on satellite imagery and ground sensors to —tracktrace onlyattracttracked how quickly ice is retreating. Scientists compare yearly measurements to —distinguishextinguishdistinctdistinguished long-term trends from short-term fluctuations. This data helps governments —planplannedplanning onlyplans water supplies that depend on glacial melt, since many rivers are fed almost —entirelyentireentiretyentire only by mountain ice.